Any board established under authority of section 715d of this title, and any agency designated under authority of section 715j of this title, may hold and conduct such hearings, investigations, and proceedings as may be necessary for the purposes of this chapter, and for such purposes those provisions of section 78u of this title relating to the administering of oaths and affirmations, and to the attendance and testimony of witnesses and the production of evidence (including penalties), shall apply.